He said: When Abu Ja`far عليه السلام left Medina for Baghdad the first time of his two journeys, I said to him upon his leaving: May I be your ransom, I fear for you in this condition – so to whom will the affair go to after you? Then, he turned his face to me laughing and said: The disappearance (ghayba) that you think of will not be this year. So when he left the second time to al-Mu`tasim, I went to him and said to him: May I be your ransom, you are leaving – so to whom will this affair go to after you? He wept until his beard was soaked, then he turned to me and said: This time you should fear for me – after me, the affair will go to my son `Ali. (al-Kafi, Volume 1, hadith 837)